SYNOPTICAL 



FLORA OF NORTH AMERICA. 



DIVISION II. GAMOPETALOUS DICOTYLEDONOUS PLANTS. 



PERIANTH consisting of both calyx and corolla, the latter more or 

 less gamopetalous. (Exceptions : A part of Jflricacece, Plumbaginacece, 

 Styracaeece, and Oleacece have unconnected petals ; some Oleacece, &c., 

 are apetalous.) 



GENERAL KEY TO THE ORDERS. 



* Ovary inferior or mainly so : stamens borne by the corolla, alternate with 

 its lobes, and 



-i Unconnected : leaves opposite or whorled. 



69. CAPRIFOLIACEJ5. Stamens as many as corolla-lobes (one fewer in Linncea, 

 doubled by division in Adoxa). Seeds albuminous. Leaves opposite : stipules none, 

 or rare as appendages to base of petiole. 



70. RUBIACE^. Stamens as many as corolla-lobes, mostly four or five. Ovary with 

 two or more cells or placentae. Seeds albuminous. Leaves all simple and entire, 

 with stipules between or within the petioles or bases, or whorled without stipules, 

 the additional leaves probably representing them. 



71. VALERIANACE^E. Stamens fewer than corolla-lobes, one to four. Ovary with 

 one cell containing a suspended ovule which becomes an exalbuminous seed, and 

 commonly two empty cells or vestiges of them. No stipules. 



72. DIPSACACEJ2. Stamens as many as or fewer than corolla-lobes, two or four. 

 Ovary simple and one-celled, with a single suspended ovule, becoming an albuminous 

 seed. Flowers capitate. Corolla-lobes imbricated in the bud. 



t -H- Stamens with anthers connate into a tube. 



73. COMPOSITE. Syngenesious stamens as many as their corolla-lobes, five, some- 

 times four. Ovary one-celled, with a solitary erect ovule, becoming an exalbuminous 

 seed in an akene. Lobes of the corolla valvate in the bud. Flowers in involucrate 

 heads. No stipules. 



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